In-depth studies in three communities of Colombia and Ecuador, over a period of two to three months in each, were the basis of the economic analysis presented in this paper. In Santa Cruz, located at the rio Naya in Colombia, the average cost per case of malaria was US$17.30 (indirect costs US$15.80 and direct costs US$1.50); the loss corresponded to 20.1of a minimum monthly wage (1986) or to a value of 5.6 days' work. In Perla de Sade, in the Cant6n Quininde of Ecuador, the average cost per case of malaria amounted to US$10.40 (indirect costs US$5.90 and direct costs US$4.50); the losses corresponded to 20.8of a minimum monthly wage (1989) and to a value of 5.7 days' work. In Calder6n in the Cant6n of San Lorenzo in Ecuador, the average cost per case of malaria was US$4.80 (indirect costs US$3.50 and direct costs US$1.30); the losses corresponded to 16.0of a minimum monthly wage (1991) with a value of 4.4 days' work.The results in these three communities, and in four additional ones, showed that the major economic impact of malaria is in the reduction of the labour force of families (indirect costs), and less so in the direct costs of care and cure. This emphasizes the economic importance of malaria because the rural familes with economies at subsistence level depend for survival particularly upon the maintenance of their labour force.
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